Sanding machine



y 1937- w. D. R. STOVALL 2,080,345

SANDING MACHINE Filed May 26, 1956 I H \r wilt/ 11111111111,

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ATTORN EY Patented May ll, 1937 UNITED STATES PATENT OFFIQE.

Application May 26,

7 Claims.

The invention relates to a sanding machine and more particularly to a readily movable sanding machine.

The primary object of the invention is the provision of a machine of this character, wherein the sanding belt is balanced and is adjustable with relation to the work'to be operated upon thereby and by reason of the character of the supporting frame of the machine the sanding belt can be brought to the work, as for example, school desks arranged within a school room or other articles of furniture fixedly disposed and in the working of the machine the surface to be cleaned or smoothed will be promptly acted upon by the sanding belt, the loose material such as wood dust or the like being collected during the operation of the machine.

Another object of the invention is the provision of a machine of this character, wherein the construction thereof is novel in its entirety and is especially designed for resurfacing school furniture where the latter becomes marred, scratched, scarred or otherwise disfigured and dirty and in the operation of the machine the surface disfigured can be cut down easily and rapidly and the original smoothness, cleanliness and texture restored.

A further object of the invention is the provision of a machine of this character, wherein the sanding belt is operated through a power motor or motors and such belt will straddle the furniture to be reconditioned where such furniture is permanently fixed in place.

A still further object of the invention is the provision of a machine of this character, which is simple in its construction, thoroughly reliable and effective in its operation, readily and easily handled, the sanding belt being balanced through a novel hanging therefor, the said belt being 40 maintained clean during the working of the same and also that is inexpensive to manufacture.

With these and other objects in view, the invention consists in the features of construction, combination and arrangement of parts as will be 45 hereinafter more fully described, illustrated in the accompanying drawing, which discloses the preferred embodiment of the invention and pointed out in the claims hereunto appended.

In the accompanying drawing:

50 Figure 1 is an elevation of the machine constructed in accordance with the invention, a portion thereof being broken away.

Figure 2 is a vertical transverse sectional view 55 through the machine.

1936, Serial No. 81,921

Figure 3 is a horizontal sectional view taken on the line 3-3 of Figure 1.

Similar reference characters indicate corresponding parts throughout the several views in the drawing.

Referring to the drawing in detail, the machine comprises a pair of bed trucks Ill, these being equipped with rollers or wheels II to render the same mobile and rising from the said trucks is an inverted substantially U-shaped stand including the vertical tubular uprights I2 and a cross top rail [3, respectively, the uprights being joined to the rail [3 through T couplings M while said uprights l2 are made fast at 15 to the trucks lfl.

Disposed crosswise of the stand is an endless sanding belt l6 supported upon rotatable relatively broad pulleys or belt wheels l1, both having their hubs l8 made fast to driven shafts l9 which are journaled in bearings 20 adjustably fitting slidable hangers 2|. for sliding movement upon the uprights l2 and the said belt I8 is sustained in a horizontal plane slightly forward of the stand, the trucks ll! being spaced the required distance apart so as to permit an article of furniture to pass therebetween and have the belt It brought into working position relative to such article of furniture.

Upon the trucks I0 are electric motors 22 each having its driving shaft 23 connected with the driven shaft through a flexible power shaft 24 so that the endless belt IE will be driven directly from the motors 22.

The bearings 20 are adjustable at 25 for permltting the tightening and slackening of the belt i6.

Arranged within each upright I2 is a coiled tensioning spring 21, its lower end being fixed at 28 to the companion truck Ill and the upper end fixed to a. sprocket chain 29 which is trained over a sprocket wheel 30 fixed to a cranked shaft 3|, this being rotatably fitted in angled bearing brackets 32 secured to the top rail l3 at opposite ends thereof and outside of the stand. These sprocket chains 29, each is engaged with a sprocket wheel 33 journaled in a bearing 34 fixed to and rising from the bearing 20 next thereto. The sprocket wheel 33 is straddled by a forked handle 35 carrying a latch 36 for engagement with the said wheel 33 so that it can be manually turned for imparting movement to the chain 29 which in conjunction with the spring 27 affords a balance for the belt l6 and the pulleys or belt wheels I8 carrying the same. By' operating the handle 35 the hangers 2| can be raised or lowered on the uprights l2 of the stand to locate the belt The hangers 2| are fitted [6 with respect to a piece of work to be operated upon thereby.

About one end of the belt I6 is a dust guard 31 which extends about the said end and is fitted with a delivery conduit 38 of a vacuum operated dirt and dust collector 39, its suction wheel 40 being driven through a belt and pulley connection 4| with the motor shaft 23, there being but one of these collectors associated with the machine so that dust and dirt removed by the sanding belt l6 willbe caught in the guard31 and collected by flow thereof through the conduit 38 to anem the collector 39. This collector has the collector bag 42 for the reception of dirt and dust as is common in vacuum cleaners.

The crank 43 of the shaft 3| constitutes a handle for the convenient turning of this shaft 3| so that by operating such handle the sanding, belt I6 can be manually adjustable forlight 'orheavy sanding operation with respect to a pieceiof work opera d, on in that t chains 29 c e moved andsuo'h chain'sarejcon tantly'underfthe tension Q c a h Sw ng 21- ceh e ied h re it ock t Wh e a h bear n ,8 rm t h settingofthe'sanding belt for a determined balased a s ment. ther f w i by we ne the Ll: 4 3 'the" belt willbe brought" into a position 9. f i t eav din iie afipn. o a piece of work being acted upon thereby.

nat'is, 01a; "dis: 1. machine of the character described comris n a' heeld t lqke end her en,- ingfor the reception of a piece of work when permanently fastened in place, sanding rne'cna nismfonthe stand and including an endless 'sandme e t r relfi t nju n qt iwher t ceived by the 'stand, power *means on'the trucks ofs aid stand an'doper ng the sanding mechanism, and spring ten ned' balancing means n ec e w hi'sa d ndinam tbe m 21A Inachineof the" character 'de c'rlbed cornprising a wheeledjtrucked stand having an openingfor'the'reception of a piece oiwork when perznanently fasten'ed'inplace, sanding mechanism on'the standand' including an endless sanding belt, for operation upon thef'wo'rk when received by'thestand, power'meanson the t'rucks'of "said stand and operating the sanding mecha ism, spring tejnsioned balancing "means" connected with said sanding me nism, and means for minute adjustment ld fsanding mechanism.

' 3fiA'm achin'ebf the characte r "de'scribe d coniprisinga wheeled trucked stand having an'openmgidr thefeception of a piece'o'f 'work'when permanentlyias'tened in placefsanding mechanism on the stand and including an endlesjstsa'ndmg belt for operation upoh the work when received by the standf' power' means "on the trucks of said stand andoperating the 'sanding mechanism, spring tensioned balancing means connect ed with said sanding mechanism; r'neans for minute adjustment of said sanding mechanism, and an automatically operated collector associated with said sanding mechanism?" 4. A machine of the character; deTscribedcomprising a wheeled trucked stand having w sp-em; ingfor' the 'receptioj" "f apiece of"'work permanently fastened in place, sanding mechanism on the stand and including an endless sanding belt for operation upon the work when received by the stand, power means on the trucks of said stand and operating the sanding mechanism, spring tensioned balancing means connected with said sanding mechanism, means for minute adjustment of said sanding mechanism, an automatically operated collector associated with said sanding mechanism, and means for tightening and slackening the belt 'of the sanding mechanism.

5. A machine of the character described comprising a wheeled trucked stand having an opening for the reception of a piece of work when permanently fastened in place, sanding mechanism on the stand and including an endless sanding belt for, operation upon the work when received by the stand, power means on the trucks of, said stand and operating the sanding mechanism, spring tensioned balancing means connected with said. sanding mechanism, means for minute adj'ustmentof said sanding mechanism,

an automatically operated collector associated ng mechanism, means for tightenwithsaid 'sa di t me and slack ing ,the'belt ofthe sanding mechanl's nfand means slidablyfs'uppG fting the sanding me' n msi tb i ai l nd- GJA h i e of the character described comprising a wheeled truckedsjtand having an opening for-the reception of a piece of work when permanentlyiasten'ed place, sanding mechanisin iithe'stjand and'inc'luding an endless sanding bjel t for operation upo'n'the work when received by the stand, power means on the trucks of sai'd'standa'ndoperating the sanding mechanisn'i'fs'pring tensioned balancing means connected with said sanding mechanis means for minute'adjiistmen'tbf' said sanding mechanism, an" auton'ia' callypperated collector'associated with'sal' k ding mechaiiism,meaiis for'tightening and slackening the belt of thesa'nding mechan sm, "means'slidably supporting the sanding r'nef hani m'upon said stand'and connections betweeifth''coll'e'ctor and the' power means for the driving of said 'collectorf" 7J1; machine of-the character described comprising a wheeled trucked stand having an open iiig tor the reception of apiece of 'work' when permanently fastene in place, sanding mechanisn'i' 'o'rl'thestand and including an eridlesssandin'g belt foroperation upon the work when received by 'the stand, power means on the trucks of said stand and operating the'san'cling mech'a' nism, spring tensibned balancing means connected 'wi'th' "saidsanding mechanism, means for minute adjustment of saidsanding mechanism, an automatically operated collector associated with said sanding mechanism, means for tightening"and slackeningthe belt of the sanding mechanism, "m'eans' slidably supporting the sanding mechanism" upon said stand, connections between the collector and the 'power means for the driving ofv said. collector, and. means for regulating the a anc n means.

ggins/ n, STOVALL. 

